Doctors practice more than just their faith in several mosques across North Texas – they are also practicing medicine, free of charge.The Islamic Association of North Texas in Richardson boasts one of the longest-running free health clinics in the Muslim community.The charitable medical services were started in 1999 by Dr. Amer Shakil and Dr. Khalida Yasmin, husband and wife from Pakistan.In nearly 20 years, they have grown to an actual clinic with an exam room, a dentist’s set up, and an optometrist’s office.